Standardize usage of virtual/override/final in content/browser/

content/browser/indexed_db/leveldb/leveldb_database.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/indexed_db/leveldb/leveldb_database.h"
 
 #include <cerrno>
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
@@ skipping 110 matching lines @@
   options.env = leveldb::IDBEnv();
   // ChromiumEnv assumes UTF8, converts back to FilePath before using.
   return leveldb::DestroyDB(file_name.AsUTF8Unsafe(), options);
 }
 
 namespace {
 class LockImpl : public LevelDBLock {
  public:
   explicit LockImpl(leveldb::Env* env, leveldb::FileLock* lock)
       : env_(env), lock_(lock) {}
-  virtual ~LockImpl() { env_->UnlockFile(lock_); }
+  ~LockImpl() override { env_->UnlockFile(lock_); }
+
  private:
   leveldb::Env* env_;
   leveldb::FileLock* lock_;
 
   DISALLOW_COPY_AND_ASSIGN(LockImpl);
 };
 }  // namespace
 
 scoped_ptr<LevelDBLock> LevelDBDatabase::LockForTesting(
     const base::FilePath& file_name) {
@@ skipping 285 matching lines @@
   const leveldb::Slice start_slice = MakeSlice(start);
   const leveldb::Slice stop_slice = MakeSlice(stop);
   // NULL batch means just wait for earlier writes to be done
   db_->Write(leveldb::WriteOptions(), NULL);
   db_->CompactRange(&start_slice, &stop_slice);
 }
 
 void LevelDBDatabase::CompactAll() { db_->CompactRange(NULL, NULL); }
 
 }  // namespace content